JP2013076595A - Flow rate display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve variations in measured values which are caused by the movement of a weight measuring device, when the flow rate is measured.SOLUTION: Measurement data is transferred to a download memory 31 through network. Weight data is subjected to differential processing by differentiation means 32, is changed into weight change data, and is stored in a first buffer memory 33. Acceleration data is subjected to differential processing by the differentiation means 32, is changed into acceleration change data, and is stored in a second buffer memory 34. The data is read at a low speed from the first buffer memory 33 and the second buffer memory 34 and is input in a noise canceller which consists of subtraction means 36, an adaptive filter 37 and a weight controller 38. Subtraction data acquired from the subtraction means 36 is input in graphical conversion means 39 to make a graph and is input in a display memory 40. A graph of urinary flow rate is displayed on a display 41.

Description

  The present invention relates to a flow rate display system that detects and displays a flow rate of a liquid such as urine.

  The commercially available urine flow rate measuring device is integrated with a dedicated toilet as described in Patent Document 1, and measures changes in the water level of the toilet, and it is difficult to easily measure at home.

  Therefore, it is conceivable to measure the urine flow rate from the change in the weight of urine flowing into a container such as a cup with a weigh scale, but it is necessary for the user to urinate by holding the weight scale by hand. The measured value fluctuates due to position fluctuation (vibration) and correct flow rate measurement is not possible.

  In addition, in Patent Document 2, in order to eliminate measurement value fluctuation caused by vibration of the weigh scale, vibration in the vertical direction of the weight scale is detected by an acceleration sensor, and a fluctuation component included in the measurement value (load value) is detected. A technique for canceling with the acceleration component is shown.

JP 2009-221794 A JP 2010-151812 A

  However, the above-described prior art is for specifying a constant weight value, that is, a fixed value over a certain period of time, and the fluctuation component included in the weight measured by using such a technique in the previous stage of the flow rate measurement. Even if an attempt is made to cancel, the cancel calculation is not in time, and as a result, fluctuations included in the measured flow rate cannot be removed.

  In order to accurately detect and display the flow rate of the liquid flowing into the container without being affected by the vibration of the container, the present invention cancels the fluctuation component using the load change data obtained by differentiating the load data. The load change data is supplied from the buffer memory to the noise canceller at a low speed.

  1st invention digitizes the load value which measures the mass of the liquid which flows in a container, the acceleration sensor which detects the acceleration which the said load cell receives, the load value obtained from the said load cell, and the acceleration value obtained from the said acceleration sensor An AD conversion circuit that outputs load data and acceleration data, a differentiation means that differentiates load data and acceleration data and outputs load change data and acceleration change data, and inputs load change data and acceleration change data. A buffer memory for storing and reading at low speed, a noise canceller for outputting noise cancellation data for reducing fluctuation components contained in load change data by inputting the output of the buffer memory, and a flow rate formed based on the noise cancellation data And display means for displaying.

  The second invention digitizes the load cell for measuring the mass of the liquid flowing into the container, the acceleration sensor for detecting the acceleration received by the load cell, the load value obtained from the load cell and the acceleration value obtained from the acceleration sensor. An AD conversion circuit that outputs load data and acceleration data, a differentiation means that differentiates the load data and acceleration data and outputs load change data and acceleration change data, and load change data and acceleration change data are stored. A buffer memory for reading at low speed, load level detecting means for inputting load data and removing high frequency components thereof to output damping control data corresponding to an increase in load, and load change output from the buffer memory Input the data and attenuate the amplitude value of the high frequency component included in the load change data according to the attenuation control data value. Amplitude control means for outputting data, a noise canceller for inputting attenuation data and acceleration change data and outputting noise cancellation data for reducing fluctuation components contained in the attenuation data, and a flow rate formed based on the noise cancellation data And display means for displaying.

  Therefore, according to the present invention, it is possible to efficiently suppress the fluctuation component included in the load change data by the container vibration and display a more accurate flow rate.

It is a front view which shows the Example of a flow rate meter main body. It is a right view which shows the Example of a flow rate meter main body. It is a left view which shows the Example of a flow rate meter main body. It is a front broken view which shows the Example of a flow rate meter main body. It is a functional block circuit diagram which shows the Example of the circuit operation | movement contained in a flow rate meter. It is a flowchart figure which shows the Example of the measurement data processing program of the microcomputer contained in a flow rate meter. It is a flowchart figure which shows the Example of the audio | voice processing program of the microcomputer contained in a flow rate meter. It is a functional block circuit diagram of Example 1 regarding the circuit operation of a recording terminal, a relay personal computer, and a display personal computer. It is waveform explanatory drawing which shows the load measured in an Example, a load change, and the change of an acceleration. It is a functional block circuit diagram of Example 2 regarding the circuit operation of a recording terminal, a relay personal computer, and a display personal computer.

  Hereinafter, embodiments of the present invention will be described based on examples with reference to the drawings.

  As shown in FIG. 1, in a portable flow rate meter in which a user holds a handle to measure urination, the lower portions of a pair of frames 2 are screwed and fixed to both sides of the main body 1. A pair of guard rings 4 for facilitating the mounting of the paper cup 3 are fixed to the upper portions of these frames 2. A foldable handle 5 is pivotally supported on the outer side of the other end of one frame 2 so as to be rotatable.

  A push-type locking pin 6 for selectively fixing the pivot position is provided near the pivot portion of the handle 5, and the handle 5 is fixed at two positions in the horizontal direction and the vertical direction. On the front of the main body 1, four push button type self-determination switches 7 are provided for the user to determine the urination feel, and the slide switch 8 is provided on the handle 5.

  The paper cup is detachably attached on the mounting table 9 on the main body 1. The self-determining switch 7 is affixed with a label (not shown), and is displayed in four stages of “good”, “slightly good”, “slightly bad”, and “bad” corresponding to each determination switch 7. ing.

  As shown in the right side view of FIG. 2, a sound emitting hole 10 for a speaker that outputs an operation guide sound is provided on the right side of the main body 1.

  As shown in the left side view of FIG. 3, a charging jack hole 11 and an LED 12 for displaying a charging state are provided on the left side of the main body 1.

  As shown in the partially broken front view of FIG. 4, the central protrusion 9 a of the mounting table 9 is in contact with the load cell 13 provided on the upper plate 1 a of the main body 1, and the weight of urine flowing into the paper cup 3 can be measured. It is configured as follows.

  An acceleration sensor 14 is provided below the load cell 13 with the upper plate 1a interposed therebetween. Further, the printed circuit board 15 in the main body 1 is provided with a circuit component (not shown) for operating the flow rate meter.

  Hereinafter, the operation of the electric circuit formed by the circuit components not shown will be described with reference to FIG. First, the flow rate meter is configured to be driven by a rechargeable battery 16, and the charging current is supplied to the battery 16 via a charging plug (not shown) inserted into the charging jack hole 11 and the charging circuit 17. The power controller 18 checks the state of charge of the battery 16 and turns on the LED 12 for charging confirmation in red during the charging period and turns on green when the battery is fully charged.

  To operate the flow rate meter, first, the power switch 19 provided on the lower surface of the main body 1 is turned on. When the power switch 19 is turned on, the power supply circuit 20 supplies power to circuit elements such as the microcomputer 21.

  The microcomputer 21 performs the main operation of the flow rate meter. On the input side, a first AD conversion circuit 23 that digitizes an analog load value continuously input from the load cell 13 and converts it into load data; And a second AD conversion circuit 24 that digitizes analog acceleration values continuously input from the acceleration sensor 14 and converts them into acceleration data.

  The first AD conversion circuit 23 and the second AD conversion circuit 24 input a common sampling pulse and convert an analog value into a digital value at the same timing.

  Further, on the input side of the microcomputer 21, there are four self-determination switches 7 and a slide switch 8 for controlling the start and end timing of the operation so that the user's urination feeling can be determined at four levels. , Connected as sensing input means.

  On the other hand, an SD card 22 and a transmitter 25 are provided on the output side of the microcomputer 21, and are configured to be able to temporarily store and transmit measured load data, acceleration data, and touch data. ing.

  Furthermore, an audio output circuit 26 is provided on the output side of the microcomputer 21, and announcement data or the like is converted into analog and input to the speaker 27.

  Inside the microcomputer 21, there is a data storage memory 21a for storing load data, acceleration data, and touch data, a read-only voice memory 21b for storing announcement data and beep sound data, and a user's self-judgment operation. It has a touch data latch means 21c for detecting an input touch level as a function.

  The data storage memory 21a stores load data and acceleration data alternately in synchronism with the sampling timing, and then temporarily stores touch data and outputs them to the outside. The sound memory 21b has measurement beep sound data for outputting a measurement beep sound P1 for informing that measurement is being performed, and measurement end beep sound data for outputting an end beep sound P2 for informing that measurement has been completed. , "Start measurement" measurement start announcement data, "Measurement stopped" measurement stop announcement data, "Measurement ended" measurement end announcement data, and "Press the judgment button." Please memorize the touch input announcement data. In the touch data latch means 21c, touch data corresponding to the self-determination switch 7 pressed by the operator after urination is stored in the data storage memory 21a.

  Further, the microcomputer 21 includes means for identifying four types in conjunction with the operation of the slide switch 8, and the ON detection means 21d indicates that the slide switch 8 has been turned on by the 2-minute timer 21e. Two seconds have passed since the slide switch 8 was turned on, the three-second timer 21f showed that three seconds had passed since the slide switch 8 was turned on, and the OFF detection means 21g showed that the slide switch 8 was turned off. Has been identified.

  Further, the microcomputer 21 is provided with a 10-second timer 21h linked to the touch data latch means 21c, and identifies that 10 seconds have passed since the start of the touch data latch.

  This 10 seconds is set as a period sufficient for the user to operate the determination switch 7 after the measurement end beep sound, the measurement end announcement, and the touch input announcement are finished after the latch is started.

  FIG. 6 is a flowchart showing a data processing program of the microcomputer 21. Initially, the standby state is maintained until the slide switch 8 is turned on in step S1.

  In step S2, it is determined whether or not two minutes have elapsed since the slide switch 8 was turned on. If it is within 2 minutes, load data is taken into the data storage memory 21a in step S3, acceleration data is taken into the data storage memory 21a in step S4, and it is checked in step S5 whether the slide switch 8 is in the OFF state. If the slide switch 8 is not in the OFF state, the process returns to step S2 and the above steps are repeated.

  If the slide switch 8 is OFF in step S5, the measurement is completed, and it is checked in step S6 whether the slide switch 8 has been switched from ON to OFF within 3 seconds. Is regarded as an erroneous operation and the data processing program is terminated.

  If it is switched after the elapse of 3 seconds or more, it is considered that the measurement is completed, and the process proceeds to step S7. In step S7, it is checked whether or not the touch data has been latched by the determination operation of the user. If not latched, a standby state is set for 10 seconds in step S8. If the touch data is latched within 10 seconds, the touch data is stored in the data storage memory 21a in step S9, and the data stored in the data storage memory 21a is stored in the transmitter 25 and the SD memory card 22 in step S10. Output. If the touch data cannot be latched within 10 seconds, it is assumed that the user does not intend to operate the determination switch 7 and the process proceeds to step 10 where data other than the touch data is transmitted to the transmitter 25 and the SD memory card 22. Output to.

  FIG. 7 is a flowchart showing the audio output processing program of the microcomputer 21. First, in step S11, the microcomputer waits until the slide switch 8 is turned on.

  When the slide switch 8 is in the ON state, the process proceeds to step S12 and a measurement start announcement “Start measurement” is generated. Next, in step S13, it is checked whether or not the slide switch 8 is OFF. If it is not OFF, the process proceeds to step S14, and it is checked whether or not two minutes have elapsed since the slide switch 8 was turned ON. If two minutes have not elapsed in step S14, the process proceeds to step S15 to generate a measurement beep sound P1. Thereafter, until the slide switch 8 is turned off or two minutes have elapsed, a measurement beep sound indicating the measurement state is periodically generated. When it is detected in step S13 that the slide switch 8 is turned off, the process proceeds to step S16, and it is checked whether or not the slide switch 8 is turned off within 3 seconds after the slide switch is turned on. If three seconds or more have not elapsed, it is regarded as an erroneous operation, and the process proceeds to step S17 to generate a measurement stop announcement “Measurement stopped”.

  On the other hand, if 3 seconds or more have elapsed, it is considered that proper measurement has been performed, and the process proceeds to step S18. Similarly, when two minutes have elapsed after the slide switch 8 is turned on in step S14, it is considered that the measurement has been completed, and the process proceeds to step S18. In step S18, an end beep sound P2 longer than the measurement beep sound P1 is generated. Subsequently, in step S19, an end announcement “Measurement is finished” is generated, and in step S20, a touch input announcement “Please press the judgment button.” Is made, and the voice announcement is ended. It should be noted that the time from the end of the measurement to the completion of step S20 is as short as about 3 seconds, and a margin of 7 seconds is ensured before the user hears the announcement and makes a determination operation in step S8 of FIG. I understand that.

  FIG. 8 shows a portable small recording terminal 28 wirelessly connected to the flow rate meter, and a hospital display personal computer 30 connected to the recording terminal 28 and the SD memory card 21 via a network such as the Internet. It is a functional block diagram explaining the operation | movement of the home relay personal computer 29 transmitted to.

  The recording terminal 28 includes a receiver 28a and a data storage memory 28b. The receiver 28a receives data obtained by measuring each time urination is performed, and data for a predetermined number of days is stored in the data storage memory 28b. Accumulated and stored.

  The measurement data for several days is temporarily stored in the data transfer memory 29 a by connecting the recording terminal 28 to the relay personal computer 29. When the recording terminal 28 is not used, the measurement data is stored in the data transfer memory 29a if the SD memory card 21 that is attached to the flow rate meter and stores the measurement data is inserted into the card slot 29b of the relay personal computer 29. Is done.

  The measurement data stored in the data transfer memory 29a by any of the above methods is transferred to the download memory 31 of the hospital display personal computer 30 via the network.

  The transferred measurement data is read from the download memory 31 in the order of load data, acceleration data, and touch data. The load data read continuously is differentiated by the differentiating means 32 and converted into load change data, which is stored in the first buffer memory 33. Next, the acceleration data continuously read out is differentiated by the differentiating means 32 and converted into acceleration change data, and stored in the second buffer memory 34. Thereafter, when touch data is included in the measurement data, the touch data is input to the character generating means 35, and the touch data is converted into character pattern data and input to the display memory 40.

  The load change data in the first buffer memory 33 and the acceleration change data in the second buffer memory 34 are sequentially output at the same timing in accordance with the processing speed of the personal computer.

Hereinafter, the principle of noise cancellation of the present embodiment will be described using mathematical expressions.
The nth bit load change data value d (n) input from the first buffer memory 33 to the subtracting means 36 is expressed by the following equation.

Also, the nth bit cancel data value y (n) output from the adaptive filter 37 is expressed by the following equation.

  That is, the cancel data value is formed by an Mth order polynomial obtained by multiplying the acceleration change data up to (M−1) bits before by an appropriate coefficient h, and approximates the acceleration change data value included in the load change data. Value.

Furthermore, the subtraction data value e (n) of the nth bit subjected to noise cancellation is expressed by the following equation.

  Therefore, the subtraction means 36 outputs a subtraction data value e (n) including the observation data value η (n) in the true load change data value s (n).

  In this embodiment, the subtractor 36, the adaptive filter 37, and the weight controller 38 constitute a noise canceller. The load change data is directly input to the subtractor 36, and the acceleration change data is input to the adaptive filter 37 and the weight controller 38. The

  Cancel data is output from the adaptive filter 37. This cancel data value y (n) is composed of an M-th order polynomial obtained by multiplying the acceleration change data from the current acceleration change data to (M−1) bits before by an appropriate coefficient and summing up. .

  The weight controller 38 compares the subtraction data value e (n) input by feedback with the acceleration change data, and sets the coefficient of each term of the polynomial of the cell data value y (n) output from the adaptive filter 37. Yes. The coefficient of each term is set to a value that approximates the cancel data value y (n) to the fluctuation component mixed in the load change data. The coefficients are well-known and various methods can be selected and adopted as necessary, so that detailed description of the coefficient setting method is omitted. The subtraction means 36 that inputs the load change data and the cancellation data outputs subtraction data that has few fluctuation components and is close to the true flow rate as noise cancellation data. Therefore, the subtraction data value e (n) has a fluctuation component value. Is almost not included.

  The display means for displaying the flow rate comprises a graphing means 39, a display memory 40, and a display 41. Subtraction data is input to the graphing means 39 for graphing and then input to the display memory 40. The The display memory 40 also receives touch information converted into character signals, and the display 41 displays the touch of urination input by the user and the graphed urine flow rate.

  In the first embodiment described above, by reading data from the first buffer memory 33 and the second buffer memory 34 at a low speed, a sufficient time necessary for the noise cancellation calculation is secured, and high-accuracy noise cancellation is possible. It has become. Further, by performing noise cancellation with the acceleration change data, it is possible to cancel a highly correlated fluctuation component with high accuracy.

  However, in the first embodiment described above, in order to cancel the noise, the acceleration data is differentiated and the noise change of the load change data is performed as the acceleration change data. However, as shown in FIG. The amplitude increases in proportion to the mass applied to the load cell, but the acceleration obtained from the acceleration sensor is not affected by the mass applied to the load cell. That is, as the urine volume to be measured increases, only the amplitude of the acceleration component mixed in the load increases. As a result, there has been a limit to improving the accuracy of noise cancellation using an adaptive filter.

  Therefore, in the second embodiment, the increase in the amplitude of the acceleration component accompanying the increase in the mass of the load to be measured is suppressed, and the correlation between the fluctuation component and the acceleration change data is further enhanced to further improve the noise cancellation effect. .

  Example 2 will be described below. 1 to 8 are common to the first embodiment and the second embodiment, the description of common portions is omitted, and only the present embodiment will be described with reference to FIG.

  FIG. 10 shows a portable small-sized recording terminal 28 wirelessly connected to the flow rate meter, and a hospital display personal computer 30 connected to the recording terminal 28 and the SD memory card 21 via a network such as the Internet. It is a functional block diagram explaining the operation | movement of the home relay personal computer 29 transmitted to.

  The recording terminal 28 includes a receiver 28a and a data storage memory 28b. The receiver 28a receives data obtained by measuring each time urination is performed, and data for a predetermined number of days is stored in the data storage memory 28b. Accumulated and stored.

  The measurement data for several days is temporarily stored in the data transfer memory 29 a by connecting the mobile terminal 28 to the relay personal computer 29. If the portable terminal 28 is not used, the measurement data is stored in the data transfer memory 29a if the SD memory card 21 that is attached to the flow rate meter and stores the measurement data is inserted into the card slot 29b of the relay personal computer 29. Is done.

  The measurement data stored in the data transfer memory 29a by any of the above methods is transferred to the download memory 31 of the hospital display personal computer 30 via the network.

  The transferred measurement data is read from the download memory 31 in the order of load data, acceleration data, and touch data. The load data read continuously is differentiated by the differentiating means 32 and converted into load change data, which is stored in the first buffer memory 33. Next, the acceleration data continuously read out is differentiated by the differentiating means 32 and converted into acceleration change data, and stored in the second buffer memory 34. Thereafter, when touch data is included in the measurement data, the touch data is input to the character generating means 35, and the touch data is converted into character pattern data and input to the display memory 40.

  The load change data in the first buffer memory 33 and the acceleration change data in the second buffer memory 34 are sequentially output at the same timing in accordance with the processing speed of the personal computer.

  In the present embodiment, load level detection means 43 that outputs load control data corresponding to an increase in load by inputting load data and removes the high frequency component thereof, and load change data is input and included in the load change data. And amplitude control means 42 for outputting attenuation data obtained by attenuating the amplitude value of the high-frequency component to be attenuated according to the attenuation control data value.

  In this embodiment, the subtracting means 36, the adaptive filter 37 and the weight controller 38 constitute a noise canceller. The attenuation data is directly input to the subtracting means 36, and the acceleration change data is input to the adaptive filter 37 and the weight controller 38. .

  Cancel data is output from the adaptive filter 37. This cancel data is composed of an M-th order polynomial obtained by multiplying the acceleration change data from the current acceleration change data up to (M−1) bits before by an appropriate coefficient and summing up.

  The weight controller 38 compares the controlled data input by feedback and the acceleration change data, and sets the coefficient of each term of the cancellation data polynomial output from the adaptive filter 37. The coefficient of each term is set to a value that approximates the cancel data to the fluctuation component mixed in the attenuation data. The coefficients are well-known and various methods can be selected and adopted as necessary, so that detailed description of the coefficient setting method is omitted. From the subtracting means 36 for inputting the attenuation data and the cancellation data, subtraction data with few fluctuation components and close to the true flow rate is output as noise cancellation data.

  The display means for displaying the flow rate comprises a graphing means 39, a display memory 40, and a display 41. Subtraction data is input to the graphing means 39 for graphing and then input to the display memory 40. Is done. The display memory 40 also receives touch information converted into character signals, and the display 41 displays the touch of urination input by the user and the graphed urine flow rate.

  In the second embodiment described above, by reading data from the first buffer memory 33 and the second buffer memory 34 at a low speed, a sufficient time necessary for the noise cancellation calculation is secured, and highly accurate noise cancellation is possible. It has become.

  Further, since the fluctuation component in the attenuation data input to the noise canceller has a high correlation with the acceleration change data as compared with the first embodiment, the noise cancellation effect is further improved.

3 paper cups (containers)
13 Load cell 14 Acceleration sensor 23 First AD conversion circuit 24 Second AD conversion circuit 32 Differentiation means 33 First buffer memory 34 Second buffer memory 36 Subtraction means (noise canceller)
37 Adaptive filter (noise canceller)
38 Weight controller (noise canceller)
39 Graphing means (display means)
40 Display memory (display means)
41 Display (display means)
43 Load level detection means 42 Amplitude control means

Claims (2)

  A load cell for measuring the mass of the liquid flowing into the container, an acceleration sensor for detecting the acceleration received by the load cell, a load value obtained from the load cell, and an acceleration value obtained from the acceleration sensor by digitizing the load data and acceleration data An A / D conversion circuit for differentiating load data and acceleration data by differentiating load data and acceleration data, and a buffer for inputting and storing load change data and acceleration change data for reading at low speed A memory, a noise canceller that inputs the output of the buffer memory and outputs noise cancellation data that reduces fluctuation components included in the load change data, and a display unit that displays a flow rate formed based on the noise cancellation data The flow rate display system characterized by providing.   A load cell for measuring the mass of the liquid flowing into the container, an acceleration sensor for detecting the acceleration received by the load cell, a load value obtained from the load cell, and an acceleration value obtained from the acceleration sensor by digitizing the load data and acceleration data An A / D conversion circuit for differentiating load data and acceleration data by differentiating load data and acceleration data, and buffer memory for storing load change data and acceleration change data and reading them at low speed Load level detection means for inputting load data, removing the high frequency component and outputting damping control data corresponding to the increase in load, and load change data output from the buffer memory to input load change Attenuation data is output by attenuating the amplitude value of the high frequency component contained in the data according to the attenuation control data value. A width control means, a noise canceller that inputs attenuation data and acceleration change data, and outputs noise cancellation data that reduces fluctuation components contained in the attenuation data, and a display that displays a flow rate formed based on the noise cancellation data Means for providing a flow rate.